911 carrera 4 3.6 MY 2003

[gtidriver]

Hopefully someone can help here, my friend has the car in the title,when he bought it last year the climate panel had a pool of liquid in the corner, he recently acquired a secondhand unit from ebay, he tried to connect the new unit and now has no lights dials and speedo, he's replaced the fuse which hadn't blown and replaced the old unit,still nothing.. any ideas..

And many thanks..